Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

My 2010 Z4 30i check engine light has come on. The car is 7 months old. The last time it came on was because I had been improperly replacing the gas cap each time I got gas. Recently I have been switching between normal/sport and sport+ modes. Has anyone had any check engine light issues with their Z4? I will be bringing it to dealership Monday morning.

Other than the gas cap, have you accidentally overfilled it with gas by chance? Kept pumping after the nozzle clicks off? That can possibly throw a CEL since it will screw with the evaporative control system.